1. Not broken: cactus, pricked and mashed, applied externally to the affected area, and replaced after 3 days.
2. In case of ulceration: Yunnan Baiyao is sprinkled on the ulceration of chilblain and bandaged.
Frostbite in winter is a common problem in clinic.
Frostbite is a very common skin disease in winter. It is because of the cold climate in winter that the exposed skin is stimulated by freezing. Over time, the subcutaneous arterioles spasm and contract. Blood stasis is produced, local tissues are deprived of oxygen, and tissue cells are damaged.
At first, the lesions were localized broad beans or purplish red lumps or indurations with bright red edges and blue centers. Symmetry was more common in the distal extremities, especially in the back of the hand and the extended side of the fingers, the edge of the foot and the extended side of the toes, lower limbs, cheeks and auricles. Consciously local pain, itching, even worse after heat, pain after ulceration.
Suffering from cold attack, the frozen skin appears pale, red and swollen, purple spots, burning itching, numbness, skin blisters and ulceration. These symptoms can last for 1-2 months until the weather gets warmer, and some patients will recur in the original site next winter. Traditional Chinese medicine believes that chilblain is caused by insufficient cold protection of exposed parts, invasion of cold pathogens and stagnation of qi and blood circulation. In addition, it is also related to factors such as poor physical fitness, intolerance to cold, sedentary activity and overwork. Humidity can accelerate the heat dissipation on the body surface, so people with sweaty hands and feet are also prone to frostbite.
Matters needing attention in daily life:
（ 1）
Actively participate in sports activities, speed up the circulation of qi and blood, and facilitate the repair of sore surface. It can also prevent frostbite from happening again.
（2）
Pay attention to cold and warmth in cold season.
（3）
Clothes, shoes and socks should be loose and dry.
（4）
Those who relapse every year can gradually develop the habit of washing face, foot, body and bath in cold water in summer to improve their cold tolerance.
（5）
People who are afraid of cold in winter can eat more hot cold-dispelling foods, such as mutton, dog meat, venison, pepper, ginger and cinnamon.
（6）
Those who get sick every year can be treated in winter and summer. Self-treatment with external rubbing drugs for several times in the dog days and infrared physiotherapy with conditions are better. Internal and external treatment should be given early before winter.